I created a forum topic on this exact situation several years ago. To my surprise back then as well, this is an easy draw in most positions. The Knight can actually defend against the Rook! It is only unique situations where the Rook side can win:
what was the principle of winning R vs N endgame
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what was the principle of Rook vs Knight endgames? I searched but couldn't find on the net, found only R vs B